The 911 caller said a suspect was armed with a bomb and passed a note to the teller, officials said.

According to the FBI, the suspect displayed a note to an employee and made a verbal threat that he would shoot a customer. The FBI released a photo of the note, which appears to have been written on the back of a deposit slip.

"He had armed himself in the barbershop with a straight-edged razor and after a period of time, he came out — he took his shirt off and he came out," Oates said. "He was challenged by the officers in the street and at some point, during that confrontation, he did raise his hand with a straight-edged razor in it, and he was shot."

The suspect's identity hasn't been released, but Oates said he is Hispanic. Oates said the officer who fired the shots is also Hispanic.

A woman who works at a nearby animal hospital said she saw the shirtless man yelling and banging on the glass of the barbershop. She said when he came out, he was yelling at officers.

"He was gesturing for them to like come at him," Stephanie Dsoto said. "The shooting part, it was really fast, I just heard the two gunshots and then I saw him go down and then I saw the cops doing CPR."

"Our nation is enduring very troubling times and as law enforcement officers, we must take every threat very seriously," Miami Beach Fraternal Order of Police president Robert Jenkins said in a statement. "The Miami Beach Fraternal Order of Police is confident that all involved acted bravely in order to protect the Miami Beach community and our visitors. We fully support a third party investigation by the Miami Dade Police Department's Homicide Bureau in order to make a fair and just assessment."

Alton Road between 15th Street and 16th Street was closed while police investigated.